Parametric study of turbulence ingestion noise for marine propellers

Hydrodynamic noise is an important component of the overall noise radiated by a ship, particularly at low frequencies where propeller noise could be dominant especially at high speed.This study proposes a simplified analytical solution of the phenomenon of spectral humps of propeller noise due to the interaction between a rotating propeller and an incident turbulent flow.The acoustic radiation is described by the Ffowcs-Williams and Hawkings analogy in the compact approximation.The inflow turbulence field is assumed to be homogeneous and isotropic and is modeled using a von Krmn spectrum.Experimental validation and comparison with more costly analytical solutions demonstrate the ability of the developed model to correctly capture the characteristics of the humps related to turbulence ingestion.From the results obtained, a parametric analysis enables us to define a criterion for the emergence and shape of turbulence ingestion humps according to the propeller advance ratio, improving the criterion proposed by Ffowcs-Williams and Hawkings in 1969.